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A car designed by teenagers that gets nearly 2000 mpg, white roofs for New York City, and how your DVR is jacking up your electric bill… this week’s green tech finds.

Puma’s “clever little bag” is biodegradeable: We mentioned Puma’s alternative to the shoe box back in April of 2010; PSFK reports that the bags will also be compostable (or, if you’re impatient, they’ll dissolve in water in a few minutes). (via Environmental Leader)
The 2000 mpg car? OK, not quite… this design by students at Kingdown School in Warminster, UK got a mere 1,980 mpg. That was more than enough for it to win the Mileage Marathon Challenge at Mallory Park track near Leicester. (via Inhabitat)

Industrial hemp… you can’t smoke it, but, apparently, you can run your car on it. That and more at this week’s green tech finds.

Recycle your iPod, buy an iPhone 4: Apparently, that’s what a lot of people are thinking. UK recyclables buyer MoPay has seen a 70% surge in iPod recycling since the release of the new iPhone. (via IT Pro Portal)

The solar smart phone:Puma’s new smart phone can run on solar power, and displays how much energy a user is saving when in sun power mode. Unfortunately, it’s only available in Europe right now… (via Springwise)

Wind farms and weather: Wind power’s one tool in our arsenal against climate change, but large-scale wind installations can end up creating their own “micro-climates” with unique weather effects. (via Greenopolis)
Greener summer road construction: Doesn’t mean you’ll get around it any faster, but the Missouri Department of Transportation is using warm-mix asphalt for road work (which requires less heat, and thus creates lower carbon emissions) while looking into materials consisting almost entirely of recycled glass.